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(No Mod-eh) 2 Sheets-Sheet 1. D NELSON LIFTING MACHINE.

' Patented July 24, 1894.

/,v VENTOP WW 8) QJQ Q w/ 7LNESSES Q/a/ (No Model.) 2 She'etS Sheet 2.

D; NELSON.

LIFTING MACHINE- -No. 523,440. Patented July24, 1894.

WITNESSES: I INVENTOI? &/W@

1m: uonms PETERS 00.. mom-umu, WASHINGTON. b c.

DAVID NELSON, OF BEN O, NEVADA, ASSIGNOR TO THE NELSON AUTOMATIC .mnNrErica.

LIFTING MACHINE COMPANY, OF SAME PLACE.

LlFTlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 523,440, dated July 24,1894.

7 Application filed June 22,1893.. $erial No. 473.468. (No model.)

To all whom it may concern.-

Be it known that I, DAVID NELSON, of Reno, in the county of Washoe andState of Nevada, have invented a new and Improved Lifting- Machine, ofwhich the following is a full, clear, and exact description.

My invention relates to a lifting machine which may be employed as ajack, orwhich may be otherwise applied.

The object of the invention is to provide a machine of great purchasingpower, combining simplicity, quickness in operation and change ofaction'with economy of construction.

Afurther object of the invention is to shift a bar or like object indirection of either end through the medium of applied eccentrics andloose dogs, and to provide a means whereby the dogs when gripping anobject will engage with it equally upon opposite sides, therebyobviating the one-sided strain to which such objects are subjected whenactuated by dogs in the usual manner.

The invention consistsin the noveloonstruction and combination of theseveral parts, as will be hereinafter fully set forth, and pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures of reference indicatecorresponding parts in all the views.

Figure 1 is a side elevation of the lifting machine employed as alifting jack. Fig. 2

' is a front elevation of the jack. Fig. 3 is a vertical section takenpractically on the line 3-3 of Fig. 2; and Figs. 4: and 5 are sideelevations illustrating the parts in two positions when the dogs areoperated to move the bar upward, Figs. 1, 2 and 3 illustrating theposiapart one below the other, which arms extend at an angle from thestandard, preferably at at the top portion of the standard. The arms 12and 13, are slotted to admit of the passage through them of a liftingbar 14, one edge of which bar, preferably its inner edge, is providedwith a series of teeth 15, and the teeth tom of the lifting bar as shownin Figs.l and 3. The teeth are given a downward inclination, as islikewise shown in the same figures, and thelifting bar is provided withan en larged head '16, at its upper end and a foot piece 17 at its lowerend, the foot piece being made to extend beyond the front or smooth edgeof the lifting bar.

A cam or eccentric 18, is pivotally located within a recess 19 producedin the standard where said standard connects with the lower arm 13. Therecess 19 extends some distance beyond the upper edge of the cam oreccentric and likewise some distance below it, as is shown in Fig. 3;and the cam or -eccentric 18 is attached to or made integral withacurved shank 20, the curve being preferably in an upwardly direction.The outer end of the shank 20 has pivotally connected with it links 21.The said links 21 are'pivotally connected at their opposite or upperends with a handle 22, the said handle being arched where the links arein connection with it, and the outer end of the handle extends welldownward, being curved away from the standard 10, as shown in Fig. 1.The upper end of the handle is made to terminate in a cam or eccentric23, which is pivotally located of the standard; and the two cams oreccentrics 18 and 23, are. so located that when one of them is operatingto lift an object placed above it the other will operate to lower ancams or eccentrics are usually made semiheart shaped, but theymay bemade of any shape that occasion may demand. The contour illustrated isthat which is usually adopted.

In connection with each cam or eccentric a dog is employed. The upperdog is located above the upper arm, and is designated as while the lowerdog, which is located a right angle, and one of the arms is located areusually made to extend from top to botwithin a recess or opening 24 madein the top object sustaining a like position to it. The

above the lower arm 13 of the standard is designated as 26. Each ofthese dogs is provided with an opening 27 through which the lift bar ispassed, and the said bar will pass freely through the openings when thedogs are in a horizontal position or at right angles to the bar. Thedogs have a gripping surface at opposite edges of the bar, one wall ofthe opening 27 in each dog engaging with the toothed surface of the liftbar, while the other will clamp or clasp the opposing edge when the dogsare carried to any other position with relation to the bar than at aright angle. Therefore, the lifting or actuating position of each dog iswhen it is diagonally located with respect to the bar, and the dogs areoperated by working the handle 22 with a pumping action, and the dogswill act automatically, one of them being raised to a diagonal positionby one of the cams while the other is restored to a horizontal positionby the remaining cam or eccentric and will drop to obtain a grip whichwill enable it to actuate the bar when its cam exerts upward tensionupon it.

A spring-controlled latch 28, is located in the outer endof each arm,the said latch terminating at its lower end in a head; and each arm isprovided with a recess 29, whichwill receive the head of its latch, andwhen the latch head enters the arm recess the upper end of the latchwillextend beyond the upper face of the arm with which it is connected,as shown in Figs. 1, 2 and 3; when, however, the latch head is drawn outof the recess, and is turned to engage with the lower face of the armwith which it is connected, the top of the latch will be drawn downwarduntil it is flush with or below the upper surface of the arm, as shownin Figs. 4 and 5.

A lift lever 30, is pivoted preferably upon one side of the lower arm,and the said lift lever when it is depressed at one end will engage withthe lower dog 26, and lift that dog to a horizontal position.

In operation, when the bar 14, is to be grad ually moved upward, as forexample to lift an object, the latches 28, are locked within the armswith which they are connected; and as shown in Figs. 4 and 5, by movingthe handle 22 with an up and down stroke, the lower cam or eccentric,for example, will be forced upward and will carry the lower dog with itin the diagonal position, and therefore the dog will lift the bar 14:upward a given number of notches, while the upper cam or coachtric willhave dropped to its lower position and will. have permitted the upperdog to drop horizontally downward to an engagement practically with theupper face of the upper arm of the standard, where it will be oppositeone of the notches in the bar. Upon the next stroke of the handle theorder of things will be reversed, as shown in Fig. 5; the lower dog willbe released by its cam and will be permitted to drop to the lower arm ofthe standard to obtain a fresh hold, while the upper cam or eccentricwill be carried to the lifting or upper position, and will carry theupper dog upward, thereby taking the bar with it. Thus at each movementof the bandle, one of the dogs is made to travel upward and the otherdog is suifered to drop downward to obtain a fresh hold, which willenable it to carry the bar upward when the upper dog is released.

If it is desired to drop the bar quickly, the handle will be carried insuch position that one of the dogs will be horizontally located, forexample, the upper dog; and either before or after placing the upper dogin its position the lower dog will be elevated or raised to thehorizontal position by operating the lift lever 30. At this time thelift bar 14, will freely drop down through the openings in the dogs.

It is not absolutely necessary to pump up or gradually lift the lift barto an elevated position, as should occasion demand that it be drawnrapidly upward to engage with an article to be lifted, for example, orto be lowered, the bar may be drawn upward by the hand, as it willfreely move in the openings in the dogs.

WVhen it is desired to gradually lower the bar 14, the latches arepermitted to extend above the arms, as shown in Figs. 1, 2 and 3;whereupon when weight is exerted upon the upper end of the bar bypumping the handle in the same manner as when a lifting action is to beobtained, the dogs will be automatically raised and lowered; theywill'be raised but slightly as they will be tripped upward by the springlatches 28 as soon as the dogs are in position to permit said latches toact, as the latches are depressed when the dogs are in an inclinedposition; and when a latch forces the dog upward it releases it from theteeth of the bar and then the other latch can grip the bar, which willhave fallen a predetermined distance, for example a distance equal toone or more teeth. The foot 17 is placedupon the bar in order that anobject may be lifted from the lower end of the bar when it cannot beengaged by its upper end. It will be observed that the dogs engageequally with opposite sides of the lift bar, and therefore do not exertwhat is termed a one-sided strain upon it.

In the modification illustrated in Fig. 6 of the drawings there is nochange in the construction of the body of the machine. The extendedhandle 22, is omitted, and both the upper and lower eccentrics areprovided with short rearwardly extending shanks, which shanks, when theeccentrics are in the same position, are substantially parallel. Theshank of the upper eccentric is designated as 23, while the shank of thelower eccentric is designated by the reference numeral 20; and in thelatter shank a longitudinal slot 20 is made near the rear end of theshank.

The shanks of the two eccentrics are connected by parallel links 31, thelinks being located one at each side of said shanks, and the upper endsof the links are pivotally com nected to the upper eccentric near itsrear end, while a sliding connection is effected between the links andthe shank of the lower eccentric by passing a pin 31 through the linksand through the slot 20 of the shank. The lower portions of the links,or those portions below the shank of the lower eccentric are carrieddownward and in direction of the body or standard 10 of the machine, andthe lower extremities of the links are pivotally connected to a socket32, at or near the center of the latter, the socket being pivotallyconnected with the standard 10 of the machine. The socket 232, isadapted to receive a handle 33, and when the machine is not in operationthe handle may be removed from the socket and the machine is therebyrendered exceedingly compact.

When the operative mechanism is constructed as shown in Fig. 6 and asabove described a maximum of purchasing power is obtained.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In a lifting machine, a guide, a lifting bar havingmovement therein and notched on one of its sides, dogs loosely mountedupon the lifting bar, cams pivoted to the guide adjacent to the notchedside of the lifting bar and adapted to engage the lower surfaces of thesaid dogs, and a connection betweenthe cams whereby they may be operatedsimultaneously, substantially as described.

2. In a lifting. machine, the combination, with a guide, a lift barhaving movement in the guide, and dogs loosely mounted upon the liftingbar, of cams one pivoted below each dog and having sliding engagementwith the lower surface thereof, the cams being oppositelylocated, onelifting while the other allows the dog to drop, and a driving mechanismconnected with both cams, whereby they are simultaneou'sly operated, asand for the purpose speoified.

'3. In a lifting machine, the combination, with the standard having twoarms forming guides, and the lifting bar adapted to move therein, ofdogs held on the said bar above each of the said arms, mechanism foractuating the dogs, and latches held to slide in the said arms so as tobe adjustable, said latches being adapted to project from the said armsand to engage with the respective dogs, as and for the purpose setforth.

4.. In a lifting machine, the combination, with the standard having twoarms forming guides, and the lifting bar adapted to move therein, ofdogs held on the said bar above each of the said arms, mechanism foractuating the dogs, and spring controlled latches having slidingmovement in the said arms and each provided with a head adapted toengage a recess in the arm, the latches being also capable of turning inthe arms to bring the heads out of engagement with the said recesses, asand for the purpose set forth.

. 5; In a lifting machine, the combination, with the guide, a lift barhaving sliding movement in the guide, and spring-controlled latcheslikewise located within the guide, of dogs loosely mounted upon the liftbar, capable of gripping opposite sides thereof, cams or eccentricsengaging one with each dog, one cam being in a lifting position whilethe other is in a releasing position, and a driving connection betweenthe two cams, whereby they are simultaneously operated, and a lift leveradapted for engagement with one of the dogs, as and for the purpose setforth.

DAVID NELSON. Witnesses:

R0. MOORE, C. J. BROOKINS.

